INT 2F - DOS 5+ TASK SWITCHER - IDENTIFY INSTANCE DATA
AX = 4B05h
ES:BX = 0000h:0000h
CX:DX -> task switcher entry point (see #02819)
Return: ES:BX -> startup info structure (see #02822) or 0000h:0000h
Notes: called by task switcher
clients with instance data should hook this call, pass it through to
the previous handler with unchanged registers using a simulated
interrupt. On return, the client should create a startup info
structure (see #02822), store the returned ES:BX in the "next"
field, and return the address of the created structure in ES:BX
all MS-DOS function calls are available from within this call
this function is supported by Novell DOS 7 DOSKEY, with structure v3.00
SeeAlso: AX=1605h,AX=160Bh,AX=4B02h